I'm configuring a communication channel in ModbusTCP. The Raspberry Pi must act like a slave and another PLC will be the Master.I assigned the right IP address for each partner and the standard port 502 for the Modbus.Why if I set 502 as a port in Codesys the bus does not work and if I set 503 does it work?I need it to be 502 because the master can't change the port for the slave.How can I solve the problem?(see picture in attachment)thank you

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